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		<b>Nitrogen dioxide (NO<sub>2</sub>)
		</b>
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				<h3>Guideline values</h3>

				<ul>
					<li>
						<label>40 &mu;g/m3 annual mean</label>
					</li>
					<li>
						<label>200 &mu;g/m3 1-hour mean</label>
					</li>
				</ul>

				<p>The current WHO guideline value of 40 µg/m3 (annual mean) was set to protect the public from the health
					effects of gaseous.</p>

				<h3>Definition and principal sources</h3>
				<p>
					As an air pollutant, NO<sub>2</sub> has several correlated activities.
				</p>

				<ul>
					<li>At short-term concentrations exceeding 200 &mu;g/m3, it is a toxic gas which causes significant
						inflammation of the airways.</li>
					<li>
						NO<sub>2</sub> is the main source of nitrate aerosols, which form an important fraction of PM<sub>2.5</sub> and,
						in the presence of ultraviolet light, of ozone.
					</li>
					<li>
						The major sources of anthropogenic emissions of NO<sub>2</sub> are combustion processes (heating, power
						generation, and engines in vehicles and ships).
					</li>
				</ul>

				<h3>Health effects</h3>
				<p>
					Epidemiological studies have shown that symptoms of bronchitis in asthmatic children increase in association with
					long-term exposure to NO<sub>2</sub>. Reduced lung function growth is also linked to NO<sub>2</sub> at
					concentrations currently measured (or observed) in cities of Europe and North America.
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				Source:
				<a href="http://www.who.int/mediacentre/factsheets/fs313/en/">WHO fact sheet on ambient (outdoor) air quality
					guidelines</a>
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